Abstract: A memory controlling method adapted for driving a memory within a computer system is disclosed. When the computer system is booted, the memory is driven and tested via the BIOS. The memory controlling method performs tests on multiple controlling signals of the memory. The memory controlling method includes steps of: detecting an active window of each controlling signal; determining whether the active windows is larger than a predetermined window; performing a parameter adjustment on the controlling signals if one of the active windows is smaller than the predetermined window; performing a phase range test between two of the control signals if the active windows are larger than the predetermined window; performing a phase adjustment on the active windows of the controlling signals if the controlling signals fails in the phase range test; and driving the memory according to the adjusted controlling signals.